DrWright, aka “typing break” is a program that forces you to take regular breaks to prevent RSI (Repetitive Strain Injury). It’s similar to workrave. It can be found in GNOME control center as “typing break”.
It used to be part of GNOME 2’s main core, but is now packaged separately.
To install in ubuntu:
sudo apt-get update
sudo apt-get install drwright
Ubuntu (PPA): https://launchpad.net/~drwright/+archive/stable
Debian (not yet): http://mentors.debian.net/package/drwright
Other: Try http://pkgs.org/download/drwright